x402station.io API reference

Bulk prepaid preflight credits

Buy a bearer creditId that lets high-volume agents call /api/v1/preflight without per-call x402 settlement.

This HTML page is served by GET /api/v1/credits. The paid API operation remains POST /api/v1/credits.

Signature
POST /api/v1/credits

Pricing
$0.50 USDC for 1000 preflights

Settlement
x402 v2 · exact · Base mainnet USDC

Canonical
https://x402station.io/api/v1/credits

x402 challenge example

HTTP/1.1 402 Payment Required
payment-required: <base64 PaymentRequiredResponse>
www-authenticate: x402
content-type: application/json; charset=utf-8

{
  "x402Version": 2,
  "error": "Payment required",
  "resource": {
    "url": "https://x402station.io/api/v1/credits",
    "description": "Bulk prepaid preflight credits"
  },
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "asset": "USDC",
      "amount": "500000",
      "payTo": "0x4053338C7cB38624C0bc23c900F78Cf8470b4E38",
      "maxTimeoutSeconds": 300
    }
  ]
}

Request body

{}

Success response

{
  "creditId": "0a44f6b8-3b7d-4f2a-9e3a-2c5fd1b0aa11",
  "balance": 1000,
  "expiresAt": "2026-09-10T00:00:00.000Z"
}

Error codes

status	meaning
`400`	Malformed JSON body, invalid URL, or missing required field.
`402`	Payment required. Decode payment-required, sign x402, retry.
`503`	Query/probe pipeline timeout. Treat as failed preflight; do not pay target blindly.
`409`	Payment transaction already minted a credit bundle; existing credit returned when available.

Notes